Finding the Third Proportional to 4,207,280 and 9,215,428

Step by Step Solution

1. Step 1: Write the proportion equation
   4,207,280 : 9,215,428 = 9,215,428 : x
2. Step 2: Convert to fraction form
   4,207,280/9,215,428 = 9,215,428/x
3. Step 3: Cross multiply
   4,207,280x = 9,215,428 × 9,215,428
4. Step 4: Simplify right side
   4,207,280x = 84,924,113,223,184
5. Step 5: Solve for x
   x = 84,924,113,223,184/4,207,280
6. Step 6: Final answer
   x = 20,185,039.56